Just made sweet potato and coconut milk soup which is absolutely delicious with literally those 2 ingredients.
Took about 15 mins.
Boiled the sweet potatoes until soft, drained most of cooking liquid off, blended in a tin of coconut milk and simmered.
I wondered (too late) if the potatoes would have been more flavoursome roasted, but it's really tasty with them boiled.
Going for a second bowl with some ground chilli flakes now.